Lathe for turning balls.



N0. 634,98! Patented Oct. 17, I899. C. A. HIRTH.

LATHE FOR TURNING BALLS.

(Application filed Nov. 28, 1898.) (No Model.) 3 Sheets-Sheet l.

No. 634,98l. Patented Oct. l7, I899.

'- c. A. H'IRTH.

LATHE FOR TUBNIING BALLS.

(Application filed Nov. 28, 1898.) {No Model.) 3 Sheets8heei 2.

No. 634,98l. Pa'tented Oct. I7, I899.

c. A. HIRTH.

LATHE FOR TURNING BALLS.

(Application filed Nov. 28, 1898.)

No Model.) 3 Sheets-5heat 3 o i o f 7 u u 70 THE nunms Pz'rzns co.womuww msnmamu, o. c

llwrrnn CARL ALBERT HIRTH, OF STUTT GART, GERMANY.

LATHE FOR TURNING BALLS.

SPECIFICATION formingpart of Letters ratent N0. 634,981.,dated October17, 1899. Application filed November 28, 1898. Serial No. 697,635. (Nomodel.)

To all whom it may OOH/(16TH:

Be it known that I, CARL ALBERT HIRTH, residing at Stuttgart, in theKingdom of Wiir temberg and Empire of Germany, have invented certain newand useful Improvements in Turning-Lathes, of which the following is aspecification.

This invention relates to lathes for turning balls or spheres; and itconsists in the novel construction and combination of the partshereinafter fully described and claimed.

In the drawings, Figure l is a longitudinal section through the lathe.Fig. 2 is a crosssection through the lathe. Fig. 3 is a plan view of thelathe. Fig. 4 is anend View showing the lever a. Fig. 5 is a side viewof a modification of the lathe, partly in longitudinal section. Fig. 6is a plan view of the'same. Fig. 7 is a cross-section of the lathe shownin Fig. 5.

A is the lathe-bed, provided with a head stock A, in which a hollowspindle B is journaled. The spindle B is driven by a conepulley d in theusual manner. A bar or blank bis fed intermittently through the hollowspindle and is revolved by it. A driving-shaft Z is provided and isrevolved in any approved manner. The halls are turned from the barb, andthe bar is fed step by step through the hollow spindle B by any approvedmechanism for that purpose-as, for instance, a double cam c-and pivotedlevers a a operatively connected with the bar I) and oscillated by thesaid cam.

A turning and cutting-off tool f is arranged crosswise of the spindle Bat its front end and is secured to a slide which isslidable in a guidef. The tool f is reciprocated by a cam h, secured on the shaft Z, whichengages with a roller f on the tool-slide. The tool f is shaped so as toturn the end portion of the rod I) to the form of a partial sphere andto cut off the said partial sphere when it turns a second partial sphereclose behind the first.

A carriage or is supported by the bed A and is slidable thereonlongitudinally of the spindle B. Two head-stocks q are carried by thecarriage n and are slidable on it transversely of the spindle B.Spindles e are journaled in the head-stocks q, and cone-pulleys e areprovided for driving the spindlese. The adjacent ends of the spindleseare cupped, so that they can engage with and grip a partial sphere whenout off from the bar Z) and revolve the said partial sphere upon an axisat a right angle to the axis upon which it was revolved by the spindleB.

The head-stocks q, together with the spindles e, are constrained to movesimultaneously toward or away from each other by any approved mechanism.A double cam. t' is secured on the shaft Z and operates two bellcranklevers 70, which are pivotally supported from the bed A and operativelyconnected with the head-st0cks q. Toothed segments k are preferablyformed on the upper ends of the be1l-crank levers and gear into teeth onthe head-stocks q, so that the said head-stocks and the carriage or canbe slid longitudinally of the spindle Bwithout disconnecting thehead-stocks g from the bell-crank lovers.

The longitudinal movement of the carriage n is effected by a cam m,secured on the shaft Z, which engages with a roller 17. The roller 'v issupported by a bracket t", which is adjustably connected to the carriage'22. by a screw 13, so that the spindles 6 can be set to engage with thepartial sphere on the end of the barb. 4

'A second turning-tool g is supported from the bed A in front of thespindle B.

When the bar I) is moved forward, so that the tool f may turn a secondpartial sphere on it, as shown in Fig. 1, the carriage or is moved back,so that the axes of the spindles are in line with the center of thefirst partial sphere, as shown in Fig. 8, and the spindles are movedtoward each other, so as to clip the first partial sphere automaticallyat the moment the said first partial sphere is cut off by the tool f.The carriage n is then moved rearwardly and the spindles e are revolved,so that the first partial sphere is finished and completed by beingrevolved in contact with the turning-tool g. The bar I) is moved forwardanother step while the first partial sphere is being operated on by thetool, g, and

the spindles e are moved apart, so that the sphere drops from betweenthem as soon as it is completed.

In the modification shown in Figs. 5, 6, and 7 the spindles e are notmoved longitudinally of the spindle B and the first partial sphere isseized by jaws r 'r as soon as it is cut off:

and is transferred by them to the spindles e. The upper jaw r is carriedby a shaft 3, and the lower jaw 'r is carried by a tubular shaft 5,which is slidable verticallyin a bearing on the bed A. The shaft 8 isalso slidable vertically in the shaft .9, and the shaft 3 is providedwith a toothed wheel 20 for oscillating it. A toothed segment to ispivoted to the bed A and gears into the said wheel. An arm to is alsopivoted to the bed and is rocked by a cam 2' secured on the shaft Z. Thearm to is connected with the segment to by a connecting-rod w The jawsare operated by two toothed wheels a: 01:, which engage with circularracks t 15, secured on the shafts sand 8', respectively. The wheels so00 also gear into each other, so that they move simultaneously inopposite directions. The Wheels 00 0c are oscillated by a pivotedbell-crank lever to, one arm of which is connected with a cam 1; on theshaft Z. The other arm of the hellcrank lever carries a toothed segmentM, which is connected either directly or indirectly with one of thewheels 00 or :0, so that the jaws seize and liberate the partial sphereat the proper moments. The tool 9 is moved into contact with thepartialsphere when the same is being revolved by the spindles e by meansof a pivoted lever g, which is operatively connected with a cam t',secured on the shaft Z. The remaining parts of themodified lathe aresimilar to those previously described where designated by the samereference-letters.

What I claim is- 1. In a lathe for turning balls, thecombinatiou,withahollow revoluble spindle, means for feeding abar stepbystep through the said spindle, and a tool slidable transversely ofthesaid spindle and operatingto turn and cut off a partial sphere fromthe said bar; of two opposed revoluble spindles arranged with their axesin line with each other and crosswise of the said hollow spindle,rneansfor moving the said two spindles toward each other so as to grip thesaid partial sphere, and a second tool operating to complete the partialsphere, substantially as set forth.

2. In a lathe for turning balls, the combination,with a hollow revolublespindle, means for feeding a bar step by step through the said spindle,and, a tool slidable transversely of the said spindle and operating toturn and cut off a partial sphere from the said bar; of two opposedrevoluble spindles arranged with their axes in line with each other andcrosswise of the said hollow spindle,meaus for moving the two saidhollow spindles toward each other so as to grip the said partial sphere,a second tool operating to complete the partial sphere, and means formoving the two said spindles longitudinally of the said hollow spindleso as to place the said partial sphere in contact with the said secondtool, substantially as set forth.

3. In a lathe for turning balls, the combination, with two opposedrevoluble spindles arranged with their axes in line with each other, andmeans for moving the said spindles toward each other so as togripapartialsphere; of a carriage supporting the said two spindles andslidable transversely of their axes, an adjustable bracket connected tothe said carriage, means for sliding the said carriage connected to thesaid adjustable bracket, and a tool for completing the partial sphere,substantially as set forth.

4. In a lathe for turning balls, the combination, witha bed, andahead-stock provided with a spindle which supports a blank; of a carriageslidable on the bed parallel with the said spindle and in front of it,two headstocks slidable on the said carriage transversely of the saidspindle and one on each side of it, a pair of opposed revoluble spindlescarried by the said slidable head-stocks, means for sliding the saidslidable head-stocks and the carriage respectively, and twotool-supports arranged one in front and the other behind the said pairofspindles,substantially as set forth.

In testimony whereof I affiX my signature in presence of two witnesses.

' CARL ALBERT HIRTH.

Witnesses:

H. WAGNER, WM. HAHN.

